丁酸

After 20 days, at the end of fermentation, the cassava residue inoculated has better sensory quality, but the treatments of adding low levels of saccharose have low lactic acid accumulation amounts and high butanoic acid accumulation amounts compared with the treatments of adding high levels of saccharose, the treatment with inoculation and 4% saccharose addition has the highest lactic acid accumulation amount, which is 18.7 g/kg, and the treatment with inoculation and 8% saccharose addition has the lowest butanoic acid accumulation amount, which is 0.141g/kg.

结果显示：在发酵开始时接种处理的乳酸菌数为5×108 cfu/g，而对照处理没有检测到；发酵结束后，接种的3个糖水平处理的外观发酵品质比未接种处理好，但糖浓度低时丁酸积累较多，乳酸积累少，接种并添加4%蔗糖的处理乳酸积累量最高，发酵物中乳酸积累达18.7 g/kg，接种并添加8%蔗糖的处理丁酸积累最少，仅为0.141 g/kg。

Among 3 cultivars, B17 occupied the least green odor contents of aromatic constituents, such as 2-hexen-1-ol acetate, butanoic acid 3-hexenyl ester and butanoic acid 3-hexenyl ester, hut had the most fruity, flowery and woody odors such as β-Ionone, 1-nonanol, Acetic acid octyl ester, Methyl benzoate, Ethyl benzoate and theaspirane, which showed that B 17 was superior to the 2 other cultivars in aroma quality.

不同品种的杨桃果实中的所含的香气成分及含量不同，B17杨桃含乙酸－反－2-己烯酯、丁酸－反－2-己烯酯、丁酸－反－3-己烯酯等青香型酯类最低而含β-紫罗兰酮、1-壬醇、乙酸辛酯苯甲酸甲酯、苯甲酸乙酯、茶螺烷等花香型、果香型及木香型成分最高，因而其香气品质要优于B10和新加坡红肉种。

A method of synthesis of butyl isobutyrate catalyzed by amidosulphonic acid has been studied.

以氨磺酸为催化剂催化合成了异丁酸丁酯，确定了酯化优化条件。

Objective This study was designed to analyze the change of gene expression and investigate the mechanism of apoptosis induced by sodium butyrate.

目的分析丁酸钠诱导Raji细胞的基因表达变化，探讨丁酸钠诱导凋亡作用机制。

The physical and chemistry character of sodium butyrate, its function in gastrointestinal and application in animal production were mainly stated in this article.

本文综述了丁酸钠的理化性质、营养生理功能和其在动物生产中的应用，并简要展望了丁酸钠研究和应用的前景。

We used ion-exchange method to remove butyric acid from fermentation broth.

采用离子交换法吸附发酵液中的丁酸，从18种树脂中筛选出了1种对丁酸吸交性能较好的树脂A。

Better results could be obtained, For 40 hours fermentation, cell dry weight and PHB concentration reached 32.7 g · L-1 and 21.4g · L-1 respectively.The synthesis of Poly (β-Hydroxybutyrate-co-β-Hydroxyvalerate) by the strain G-IIIy from different precusor was studied. It was found that the strain G-IIIy could accumulate PHBV with sucrose as carbon source and propionic acid or valeric acid as precursor . In 2L self-controlled fermentor, the dry cell weight, PHBV concentration and PHBV content reached 35.8g·L-1, 22.6g·L-1 and 38.4% respectively in the case of fermentation for 42 hours and the propionic acid as precursor.

研究了添加不同前体物，G-Ⅲy菌株生产聚β-羟基丁酸和聚β-羟基戊酸共聚物的发酵条件，结果表明，此菌株能以丙酸或戊酸为前体，在蔗糖为碳源的条件下合成PHBV共聚物；在2L发酵罐中，以丙酸为前体，发酵16小时开始流加丙酸，根据发酵液pH值变化控制丙酸流加量，发酵42小时，细胞干重、PHBV产量和含量分别达到35.8g/L，22.6g/L，63.13％。

A novel drum organooxotin cluster hexameric phenyloxotin 3 indolpropylcarboxylate was synthesized by the reaction of Ph 3SnOH with 3 indolpropylcarboxylic acid in 1∶1 molar ratio.

利用Ph3SnOH和 3 吲哚丁酸以 1∶1摩尔比反应，合成了新型含羧酸配体的鼓形有机锡氧簇合物：六聚苯基锡氧 3 吲哚丁酸酯。

Thirdly, on the basis of the optimal reaction conditions of synthesis of borneolacetate, using borneol 、 isoborneol, acetic acid, propionate、 butyrate and isobutyric acid as the starting material and nanometer solid superacid (S_2O_8)~(2-)/ZrO_2 or (SO_4)~(2-)/ZrO_2-La_2O_3 as the catalyst ,a series of compounds ( borneol ester and isoborneol ester ) which had six new compounds were prepared.

以合成乙酸冰片酯的最佳反应条件为基准，采用纳米固体超强酸S_2O_8~(2-)/ZrO_2或SO_4~(2-)/ZrO_2-La_2O_3为催化剂，以冰片、异冰片、乙酸、丙酸、丁酸、异丁酸为原料，合成了系列正、异冰片酯(其中6个末见文献报道)。

Results showed that extraction abilities depends on the hydrophobic of solutes which pK〓 values are similar, e. g. acetic, propionic, butyric and valeric acids, while pK〓 values affect dominantly the extraction abilities of acids with similar hydrophobic, e. g. formic, acetic, chloroacetic, dichloroacetic, and trichloroacetic acids. Meanwhile, diluents and TOA concentration also affect the extraction equilibria of acids through the specific basicity of TOA .

TOA对酸性差别很小的一元羧酸如乙酸、丙酸、丁酸、戊酸的萃取能力主要取决于羧酸的疏水性参数logP；TOA对疏水性参数差别较小的羧酸如甲酸、乙酸、一氯乙酸、二氯乙酸、三氯乙酸的萃取能力主要取决于羧酸的电性参数；稀释剂的种类、TOA的浓度都会影响TOA的表观碱度pH〓，并通过TOA的表观碱度影响羧酸的萃取平衡。

I can not make it blossom and suits me

我不能让树为我开花

When temperatures are above approximately 80 °C discolouration of the raceways or rolling elements is a frequent feature.

当温度高于 80 °C 左右时，滚道或滚动元件褪色是很常见的特征。